| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Libra |
| 2M1510 A | |
| Right ascension | 15h 10m 47.86s[2] |
| Declination | −28° 18′ 17.5″[2] |
| 2M1510 B | |
| Right ascension | 15h 10m 47.60s[3] |
| Declination | −28° 18′ 23.4″[3] |
| Characteristics | |
| 2M1510 A | |
| Spectral type | M9γ + L1β(?) (near-IR)[1][4] |
| Apparent magnitude (G) | 17.487[2] |
| Variable type | eclipsing[1] |
| 2M1510 B | |
| Spectral type | M9γ (near-IR)[1] |
| Apparent magnitude (G) | 18.886[3] |
| Astrometry | |
| 2M1510 A | |
| Radial velocity (Rv) | -12.9 ± 0.4[1] km/s |
| Proper motion (μ) | RA: −118.747±0.492[2] mas/yr Dec.: −46.865±0.420[2] mas/yr |
| Parallax (π) | 27.2203 ± 0.2665 mas[2] |
| Distance | 120 ± 1 ly (36.7 ± 0.4 pc) |
| 2M1510 B | |
| Radial velocity (Rv) | -12.0 ± 0.3[1] km/s |
| Proper motion (μ) | RA: −117.458±0.893[3] mas/yr Dec.: −45.713±0.746[3] mas/yr |
| Parallax (π) | 27.6869 ± 0.4939 mas[3] |
| Distance | 118 ± 2 ly (36.1 ± 0.6 pc) |
| Orbit[1] | |
| Primary | 2M1510 Aa |
| Companion | 2M1510 Ab |
| Period (P) | 20.9022+0.0059 −0.0056 days |
| Semi-major axis (a) | 0.0627 ± 0.0014 au |
| Eccentricity (e) | 0.309 ± 0.022 |
| Inclination (i) | 88.5 ± 0.1° |
| Details[1] | |
| 2M1510 Aa | |
| Mass | 0.0382+0.0028 −0.0026 M☉ |
| Radius | 1.575 RJup |
| Luminosity | 0.00063±0.00001 L☉ |
| Surface gravity (log g) | 4.55 cgs |
| Temperature | 2,400 K |
| Rotational velocity (v sin i) | 8.7±1.0 km/s |
| Age | 45 ± 5 Myr |
| 2M1510 Ab | |
| Mass | 0.0375+0.0029 −0.0028 M☉ |
| Radius | 1.575 RJup |
| Luminosity | 0.00063±0.00001 L☉ |
| Surface gravity (log g) | 4.55 cgs |
| Temperature | 2,400 K |
| Metallicity [Fe/H] | 0.0 dex |
| Rotational velocity (v sin i) | 6.8±1.5 km/s |
| Age | 45±5 Myr |
| Other designations | |
| Database references | |
| SIMBAD | A |
| B | |
2MASS J15104761–2818234, sometimes shortened to 2M1510, is a triple or possibly quadruple brown dwarf system, consisting of the eclipsing binary 2M1510A and the wide companion 2M1510B.[1] 2M1510A was found to be an eclipsing binary in the first light data of the SPECULOOS telescopes. It is only the second eclipsing binary brown dwarf found so far (as of March 2020), the other is 2M0535-05. The system verified theoretical models for how brown dwarfs cool. The system is located 120 light-years away from earth in the constellation Libra.[5]
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